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1. 发明授权

US07545421B2 Apparatus, system, and method for optimizing gamma curves for digital image devices 有权
标题翻译：用于优化数字图像设备的伽马曲线的装置，系统和方法
公开(公告)号：US07545421B2
公开(公告)日：2009-06-09
申请号：US11146484
申请日：2005-06-06
申请人： Shuxue Quan , Andrew Chinchuan Chiu , Xiaoyun Jiang
发明人： Shuxue Quan , Andrew Chinchuan Chiu , Xiaoyun Jiang
IPC分类号： H04N5/202 , H04N17/00 , H04N17/02
CPC分类号： H04N9/69 , H04N1/6077 , H04N1/6083
摘要： An apparatus, system, and method provide optimization of color space conversion using a joint quality metric representing differences between reference human visual representations and converted device captured image representations in a perceptual uniform color space, where the conversion includes transforming a nonstandard color space (RGB) to a perceptual standard color space (sRGB) and where the joint quality metric includes a color portion, a noise portion, and a contrast portion. An optical sensor produces a digital reference signal when capturing an image of a reference source such as a Macbeth ColorChecker color rendition chart. After white balancing and color correcting the digital reference signal, the gamma curve parameters are determined by minimizing the joint quality metric which is based on differences, within a uniform perceptual color space such as CIELAB, between the gamma curve compensated signal and the standard values for the reference source. The noise portion and contrast portion take into account the noise and the contrast of the gamma curve compensated signal resulting in a gamma curve parameter that is optimized with respect to color, noise, and contrast.
摘要翻译：装置，系统和方法使用表示参考人类视觉表示之间的差异的联合质量度量和感知统一色彩空间中的转换器件捕获图像表示来提供色彩空间转换的优化，其中转换包括变换非标准颜色空间（RGB）到感知标准色彩空间（sRGB），并且其中联合质量度量包括颜色部分，噪声部分和对比度部分。当捕获诸如Macbeth ColorChecker颜色再现图表的参考源的图像时，光学传感器产生数字参考信号。在白平衡和颜色校正数字参考信号之后，伽马曲线参数通过最小化基于伽马曲线补偿信号和标准值之间的统一感知色彩空间（例如CIELAB）内的差异的联合质量度量来确定参考来源。噪声部分和对比部分考虑了伽马曲线补偿信号的噪声和对比度，导致相对于颜色，噪声和对比度优化的伽马曲线参数。

2. 发明授权

US07728880B2 Automatic white balance method and apparatus 有权
标题翻译：自动白平衡方法和装置
公开(公告)号：US07728880B2
公开(公告)日：2010-06-01
申请号：US11043572
申请日：2005-01-25
申请人： Szepo (Bob) Hung , Ananthapadmanabhan Kandhadai , Andrew Chinchuan Chiu
发明人： Szepo (Bob) Hung , Ananthapadmanabhan Kandhadai , Andrew Chinchuan Chiu
IPC分类号： H04N9/73 , H04N5/228 , H04N5/202 , H04N5/20 , H04N1/46 , G03F3/08 , G06K9/00
CPC分类号： H04N1/608 , H04N1/6086 , H04N9/735
摘要： Automatic white balance of captured images can be performed based on a gray world assumption. Initially, a flat field gray image is captured for one or more reference illuminations. The statistics of the captured gray image are determined and stored for each reference illumination during a calibration process. For each subsequent captured image, the image is filtered to determine a subset of gray pixels. The gray pixels are further divided into a one or more gray clusters. The average weight of the one or more gray clusters is determined and a distance from the average weights to the reference illuminants is determined. An estimate of the illuminant is determined depending on the distances. White balance gains are applied to the image based on the estimated illuminant.
摘要翻译：可以基于灰色世界假设执行拍摄图像的自动白平衡。最初，对于一个或多个参考照明捕获平坦场灰色图像。在校准过程中，为每个参考照明确定捕获的灰度图像的统计数据并存储。对于每个后续捕获的图像，滤波图像以确定灰色像素的子集。灰色像素被进一步分成一个或多个灰色簇。确定一个或多个灰色簇的平均重量，并确定从平均重量到参考光源的距离。根据距离确定光源的估计。基于估计的光源将白平衡增益应用于图像。

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